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Outlier Detection Calculator
Find outlier fences using the IQR rule from quartiles.
chart Free Online Tool
⚡ Instant Results
📊 Clear Comparison
🔒 100% Free Tool
Lower fence
Compare Your Options And Get Clear Answers
Find outlier fences using the IQR rule from quartiles.
Outlier Detection Estimator
Enter your numbers below for an instant estimate.
0
💡 Tip: Investigate before removing data.
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
Outlier Quick Guide
Typical values for reference.
| First quartile Q1 | Third quartile Q3 | IQR multiplier | Lower fence |
|---|---|---|---|
| 20 | 40 | 1.5 | -10.0 |
| 20 | 40 | 3 | -40.0 |
| 10 | 90 | 1.5 | -110 |
| 5 | 6 | 1.5 | 3.50 |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Outlier Detection Calculator FAQ
Answers to common questions about this calculator.
It uses the formula shown with your inputs. Real conditions vary, so treat it as a guide.
Investigate before removing data.
It is an estimate based on the inputs you enter. Check real quotes, labels or official guidance for important decisions.
Yes. Replace each input with your own figures and the result updates instantly.